Extract Url & Title from link field in Drupal 8?

I'm trying to retrieve the *URL* and the *Title* values of a [Link field](

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) in **Drupal 8**.

In my custom controller, I retrieve the nodes with:

$storage = \Drupal::entityManager()->getStorage('node');
$nids = $storage->getQuery()
->condition('type', 'partners')
->condition('status', 1)
->execute();

$partners = $storage->loadMultiple($nids);

When I loop throught all my nodes, to preprocess vars I'll give to my view, I would like to retrieve the *URL* and the *Title*.

foreach ($partners as $key => $partner) {
$variables['partners'][] = array(
'image' => $partner->field_logo->entity->url(),
'url' => $partner->field_link->value, // Can't retrieve values of link field
);
}

Unfortunately, I don't found how to retrieve the *URL* and the *Title* of **field_link**.

Thanks for your help.